The set of all values that can be substituted for the
variables in each equation of a
system and that satisfy all the equations of the system simultaneously.
Example
Consider the system of equations
y = 2
x and
y = 4
x² − 1 :

The solutions to this system are the ordered pairs of coordinates ([latex]\frac{1 + \sqrt{5}}{4}[/latex],[latex]\frac{1 + \sqrt{5}}{2}[/latex]) and ([latex]\frac{1 – \sqrt{5}}{4}[/latex],[latex]\frac{1 – \sqrt{5}}{2}[/latex]).